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Finding the Fourth Proportional to 1,786.61, 2,679.02 and 660.39

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Solution

The fourth proportional to 1,786.61, 2,679.02 and 660.39 is: 990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,786.61 : 2,679.02 = 660.39 : x
  2. Step 2: Convert to fraction form
    1,786.61/2,679.02 = 660.39/x
  3. Step 3: Cross multiply
    1,786.61x = 2,679.02 × 660.39
  4. Step 4: Simplify right side
    1,786.61x = 1,769,190.86
  5. Step 5: Solve for x
    x = 1,769,190.86/1,786.61
  6. Step 6: Final answer
    x = 990.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.